The world's largest twinjet Boeing 777 was grounded in Japan and Unites States after United Airlines faced an emergency landing due to an engine failure on one of the planes in Denver. United Airlines said it was grounding all 24 of its Boeing 777s. The Boeing 777-200 plane, with 231 passengers and 10 crew on board, was heading to Honolulu when it suffered an engine failure soon after takeoff, the airline said. Footage and photos of the twinjet's parts falling from the sky went viral on social media. FAA, the Aviation Administrator in the US, issued an emergency airworthiness directive as well. Japan was quick to follow ordering airlines to stop flying 777s immediately.